下面的例子包含了如果展开的中心组件的内容超出了它的边界时的滚动行为。此外，中心组件占用视口中100%的剩余空间。
关于这个课题jsfiddle
html, body, .r_flex_container{
height: 100%;
display: flex;
flex-direction: column;
background: red;
margin: 0;
}
.r_flex_container {
display:flex;
flex-flow: column nowrap;
background-color:blue;
}
.r_flex_fixed_child {
flex:none;
background-color:black;
color:white;
}
.r_flex_expand_child {
flex:auto;
background-color:yellow;
overflow-y:scroll;
}
可以用来演示此行为的html示例
<html>
<body>
<div class="r_flex_container">
<div class="r_flex_fixed_child">
<p> This is the fixed 'header' child of the flex container </p>
</div>
<div class="r_flex_expand_child">
<article>this child container expands to use all of the space given to it - but could be shared with other expanding childs in which case they would get equal space after the fixed container space is allocated.
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</article>
</div>
<div class="r_flex_fixed_child">
this is the fixed footer child of the flex container
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<p> another line</p>
</div>
</div>
</body>
</html>
